It may be 2nd round or rebound psychosis. It would be good to contact a psych and make a plan that doesn't involve a shot. AP pills can help these feelings be managed, and then have no lasting effect once you are off them. But dont wait until it's too late...the worst thing that can happen is that you go off the deep end and end up with the shot again.
My therapist and I put together something called a Mental Health Advance Directive. It's a signed document that instructs any professionals what to do in case you are incapacitated. You can instruct them to never give you a shot. You can even instruct them to not treat you. You can also designate someone to make decisions on your behalf in this document.
To be clear, I haven't been on the shit since Jan 2019. I had rebound psychosis in Mar 2020 ( around the same time off as you) ended up in the ward involuntarily, was on invega pills for 8 days and straightened out. I have not taken anything, or had any psychosis since then. But I have been working with a therapist regularly.